Summary
Rabbit xenoantiserum was produced against a human leukemia cell line (NALL-1) derived from a patient with acute lymphoblastic leukemia, and IgG was purified. Anti-NALL-1 rabbit IgG was reacted with NCS, an unique membrane-reactive anticancer antibiotic, in the presence of water-soluble carbodiimide. The resulting mixture was concentrated and chromatographed on a Sephadex G-200 column. The first and second fractions were shown by immunoelectrophoresis and the Ouchterlony double-diffusion method to contain NCS-IgG but not free NCS. The conjugates inhibited the growth of Sarcina lutea, and the growth and 3H-TdR incorporation of NALL-1 cells. A membrane immunofluorescent test with FITC-labeled rabbit anti-NCS and goat anti-rabbit IgG antibodies demonstrated specific localization of NCS-IgG on NALL-1 cell surfaces. These results indicate that IgG-bound NCS retained both NCS and antibody activities, and thus should be useful for cancer therapy.
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Kimura, I., Ohnoshi, T., Tsubota, T. et al. Production of tumor antibody-neocarzinostatin(NCS) conjugate and its biological activities. Cancer Immunol Immunother 7, 235–242 (1980). https://doi.org/10.1007/BF00205472
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DOI: https://doi.org/10.1007/BF00205472